Point hardcoded sidebar links to the new pygobject docs

The old docs redirect there anyway, and the new tutorial page has
links to multiple tutorials and not just gtk3

pgidocgen/gen/data/index/sidebar.html

@@ -140,8 +140,8 @@
         </div>
         <div id="favourites">
             <ul>
-                <li><a href="https://python-gtk-3-tutorial.readthedocs.org/" target="_parent" title="Python GTK+ 3 Tutorial">Python GTK+ 3 Tutorial</a></li>
-                <li><a href="https://pygobject.readthedocs.org/" target="_parent" title="PyGObject Tutorial">PyGObject Tutorial</a></li>
+                <li><a href="https://pygobject.gnome.org/tutorials/" target="_parent" title="PyGObject Tutorials">PyGObject Tutorials</a></li>
+                <li><a href="https://pygobject.gnome.org/" target="_parent" title="PyGObject Documentation">PyGObject Documentation</a></li>
             </ul>
         </div>
     </div>